The Portwell PEB-9783G2AR comes loaded down with 20 USB ports.
USB Overload: Portwell Motherboard Has 20 USB Ports : Read more
USB Overload: Portwell Motherboard Has 20 USB Ports : Read more
Is it possible that 3.1 supports video pass through? I haven't got the hardware to try that. But pcie uses the same lanes as sata etc so it might be possible. It is a common error non-mining hardware users could make.This board is pretty useless for miners. USB to PCIe adapters don't work on real USB ports, they use the physical USB connector to transmit normal PCIe signals.